diff --git a/.github/workflows/unitTest.yaml b/.github/workflows/unitTest.yaml
index b151598f..6c13d695 100644
--- a/.github/workflows/unitTest.yaml
+++ b/.github/workflows/unitTest.yaml
@@ -36,7 +36,7 @@ jobs:
           apt-get -y install xorg-dev libglu1-mesa libgl1-mesa-dev xvfb libxinerama1 libxcursor1 libswt-gtk-4-java libswt-gtk-4-jni libxml2-utils bc
       - name: Unit test
         run: |
-          xvfb-run --auto-servernum sbt coverage test coverageAggregate
+          LANG=C.utf-8 xvfb-run --auto-servernum sbt coverage test coverageAggregate
 
       - name: Archive Test Results
         if: always()